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Bright spots on clear anodized aluminum

We are anodizing on 6063 T6 alloy, and having a problem of bright spots which occur only after anodizing; this is not visible after pre cleaning in either caustic or phosphoric acid . At some difficult to access area wherein no buffing wheel can reach, has more of this defect, Can you let me know the reason why this happens.

Baldev Singh
sameer Eclipse - Vadodara, Gujarat, INDIA
2005

This problem is called "hot spots". They are caused by extrusion contacting carbon supports on the run-out table and being improperly cooled.
Improve cooling to solve the problem.

Juan Quintero
- Maracay, Aragua, Venezuela
2005

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